Two ideal Carnot thermodynamic engines have the same efficiency. One operates between 5.0 × 102 K and 3.0 × 102 K, and the other between 4.0 × 102 K and some lower temperature. What is the lower temperature?
A) 200 K
B) 220 K
C) 240 K
D) 260 K
E) 280 K
C
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An atom can be excited
a. if it emits a photon. b. if it collides with another atom or electron. c. if it absorbs a photon. d. if it emits a photon or if it collides with another atom or electron. e. if it collides with another atom or electron or if it absorbs a photon.
The velocity-dependent force that produces air motion and is associated with Earth's rotation is called the ______________
Fill in the blank(s) with correct word
Mercury has only a trace atmosphere because
A. its slow rotation allows atmospheric gases to escape the planet. B. its close proximity to the Sun allows the Sun to gravitationally pull gases directly off the surface of Mercury. C. impacts from planetesimals caused its original atmosphere to evaporate away. D. its smaller size means it has gravitational attraction that is too weak to hold onto an atmosphere.
A baseball is thrown and lands 120 m away. While the ball is in flight, assuming the effect of air friction is negligible, which of the following is true?
a. At maximum height the ball has its greatest kinetic energy. b. The horizontal component of the baseball's kinetic energy is constant. c. The vertical component of the baseball's kinetic energy is constant. d. The mechanical energy of the baseball is greater when nearer to the ground. e. No answer above is correct.